How do I Round Down my TIMESTAMPDIFF formula

Summary:

I have a TIMESTAMPDIFF formula to calculate the number of years but it rounds it up in OTBI, and I need it to round down to show completed years.

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Code Snippet (add any code snippets that support your topic, if applicable):

TIMESTAMPDIFF(SQL_TSI_YEAR, "Workforce Management - Worker Assignment Real Time"."Worker Assignment Details"."PER_ASG_DF_CNTNS_SRVC_T_", CURRENT_DATE)